CN218096667U - Cascade compression refrigeration system, refrigerating plant - Google Patents
Cascade compression refrigeration system, refrigerating plant Download PDFInfo
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- CN218096667U CN218096667U CN202221698245.2U CN202221698245U CN218096667U CN 218096667 U CN218096667 U CN 218096667U CN 202221698245 U CN202221698245 U CN 202221698245U CN 218096667 U CN218096667 U CN 218096667U
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Abstract
The utility model provides a cascade compression refrigerating system, refrigerating plant, refrigerating system includes high-temperature stage and low-temperature stage refrigeration cycle return circuit, high-temperature stage refrigeration cycle return circuit includes high-temperature stage compressor, parallelly connected branch road, the evaporation department, the diverter valve reaches the high-temperature stage muffler of connecting evaporation department and high-temperature stage compressor, parallelly connected branch road is including parallelly connected first that sets up, second and third cooling branch road, first cooling branch road is including the first throttling arrangement and the high-temperature stage evaporimeter that set up in series, second cooling branch road is including second throttling arrangement, third cooling branch road is including third throttling arrangement, the first refrigerant that flows through first, second throttling arrangement respectively with the first refrigerant heat transfer that flows through high-temperature stage muffler; the low-temperature-stage refrigeration cycle circuit comprises a condensation part, and the second refrigerant flowing through the condensation part exchanges heat with the first refrigerant flowing through the evaporation part. The utility model discloses can solve the problem that current refrigerating plant refrigeration efficiency is low, low temperature level compressor starting pressure is big in the use.
Description
Technical Field
The utility model relates to a refrigeration plant technical field especially relates to a cascade compression refrigerating system and have its refrigerating plant.
Background
Along with the continuous improvement of people's standard of living and the sound of healthy life theory, also more and more to the kind and the reserve volume of eating material, but the storage condition and the fresh-keeping requirement of different edible materials are not the same, need classify different edible materials to store it in different warm areas.
Therefore, a plurality of compartments with different temperature zones in the refrigeration device are needed to meet the requirement of classified storage of different food materials, the existing refrigeration device usually adopts a cascade compression refrigeration system to refrigerate the different compartments, however, the existing refrigeration device often has the problems of low refrigeration efficiency and large starting pressure when a low-temperature stage compressor is started in the use process.
Disclosure of Invention
In order to solve the technical problem, an object of the utility model is to provide a cascade compression refrigerating system and refrigerating plant who has it to solve current refrigerating plant and often have the problem that low, the low temperature level compressor of refrigeration efficiency is big when starting in the use.
In order to achieve one of the above objects, one embodiment of the present invention provides a cascade type compression refrigeration system, which comprises,
the high-temperature stage refrigeration cycle loop comprises a high-temperature stage compressor, a parallel branch, an evaporation part, a switching valve and a high-temperature stage gas return pipe, wherein the switching valve is arranged at an inlet of the parallel branch, the high-temperature stage gas return pipe is connected with the evaporation part and the high-temperature stage compressor, a first refrigerant flows through the high-temperature stage refrigeration cycle loop, the parallel branch comprises a first cooling branch, a second cooling branch and a third cooling branch which are arranged in parallel, the switching valve is selectively communicated with at least one of the first cooling branch, the second cooling branch and the third cooling branch, the first cooling branch comprises a first throttling device and a high-temperature stage evaporator which are arranged in series, the second cooling branch comprises a second throttling device, and the third cooling branch comprises a third throttling device;
and the low-temperature stage refrigeration circulation loop comprises a low-temperature stage compressor and a condensation part, wherein a second refrigerant flows in the low-temperature stage refrigeration circulation loop, and the second refrigerant flowing through the condensation part exchanges heat with the first refrigerant flowing through the evaporation part.
As a further improvement of an embodiment of the present invention, the low-temperature stage refrigeration cycle circuit further includes a low-temperature stage compressor, a low-temperature stage throttling device, a low-temperature stage evaporator and a first air return pipe section, which are arranged in series, and the condensation portion is located between the low-temperature stage compressor and the low-temperature stage throttling device.
As a further improvement of an embodiment of the present invention, the second refrigerant flowing through the first return-air pipe section exchanges heat with the second refrigerant flowing through the low-temperature stage throttling device.
As a further improvement of an embodiment of the present invention, the low-temperature stage refrigeration cycle loop further includes a second air return pipe section and a heat release pipe section, the second air return pipe section is located the low-temperature stage evaporator with between the low-temperature stage compressor, the heat release pipe section is located the low-temperature stage compressor with between the condensation portion, flow through the second refrigerant in the second air return pipe section and flow through the second refrigerant heat exchange in the heat release pipe section.
As a further improvement of an embodiment of the present invention, the second return air pipe section is located between the first return air pipe section and the low-temperature stage compressor.
As a further improvement of an embodiment of the present invention, the second return air pipe section and the heat release pipe section are sleeved or attached to each other.
As a further improvement of an embodiment of the present invention, the low-temperature throttling device is a capillary tube, and the first return air pipe section is sleeved with or attached to the low-temperature throttling device.
As a further improvement of an embodiment of the present invention, the first throttling device and the second throttling device are respectively sleeved or attached to the high-temperature-level air return pipe.
In order to realize one of the above objects of the present invention, an embodiment of the present invention further provides a refrigeration device, which comprises a box body, and further comprises the above-mentioned overlapping type compression refrigeration system, the box body has a first storage chamber and a second storage chamber, the low temperature refrigeration cycle loop is the cooling of the first storage chamber, and the high temperature refrigeration cycle loop is the cooling of the second storage chamber.
As a further improvement of an embodiment of the present invention, the refrigeration apparatus further includes a controller, the controller is connected to the switching valve, and is configured to: and controlling the communication state of the switching valve with the first cold supply branch, the second cold supply branch and the third cold supply branch according to the temperature of the first storage chamber and the second storage chamber.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses a cascade compression refrigeration system and a refrigeration device with the same, when a first refrigerant circulates in a first cooling branch, a high-temperature evaporator supplies cooling for a second storage chamber; when the first refrigerant circulates in the second cooling branch, the first refrigerant flows out of the second cooling branch to the evaporation part in the high-temperature-stage refrigeration cycle circuit, and the first refrigerant in the evaporation part can absorb the heat of the second refrigerant flowing through the condensation part through the heat exchange between the second refrigerant flowing through the condensation part and the first refrigerant flowing through the evaporation part, so that the temperature of the second refrigerant in the condensation part can be further reduced, and the second refrigerant is precooled for the low-temperature-stage refrigeration cycle circuit, and the low-temperature-stage refrigeration cycle circuit can realize lower temperature; meanwhile, the first refrigerant flowing through the first throttling device and the first refrigerant flowing through the second throttling device exchange heat with the first refrigerant flowing through the high-temperature-stage return pipe respectively, so that the first refrigerant in the high-temperature-stage return pipe can be used for cooling the first refrigerant in the first throttling device and the second throttling device, the refrigerating capacity is increased, the suction temperature of the high-temperature-stage compressor is increased to about the ambient temperature, the refrigerating efficiency of the high-temperature-stage compressor is improved, and the working efficiency of the high-temperature-stage refrigerating circulation loop is improved; when the low-temperature stage compressor is started, the first refrigerant can circulate in the third cooling branch, so that the problem of high starting pressure at the moment of starting the low-temperature stage compressor can be solved.
Drawings
Fig. 1 is a schematic structural diagram of a cascade compression refrigeration system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings.
In the various figures of the present invention, certain dimensions of structures or portions are exaggerated relative to other structures or portions for ease of illustration, and thus, are used only to illustrate the basic structure of the subject matter of the present invention.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish these descriptive objects from one another.
An embodiment of the utility model provides a refrigerating plant, including the box and the door body, have the storing room in the box, the door body is used for opening or closes the storing room, and refrigerating plant still includes refrigerating system, and refrigerating system locates in the box and to the storing room cooling. Specifically, the refrigerating device can be set as a refrigerator, a freezer, or the like, so as to meet the requirements of different users and different application scenarios.
In this embodiment, the box body has a first storage chamber and a second storage chamber, the first storage chamber may be a temperature-changing chamber or a deep-cooling chamber, and the second storage chamber may be a refrigerating chamber or a freezing chamber. The refrigerating system adopts a cascade compression refrigerating system 100, and specifically comprises a high-temperature-stage refrigerating circulation loop 1 and a low-temperature-stage refrigerating circulation loop 2.
For convenience of description, in the present embodiment, the high-temperature-stage refrigeration cycle circuit 1 supplies cold to the second storage compartment, and the low-temperature-stage refrigeration cycle circuit 2 supplies cold to the first storage compartment. Of course, the two may be interchanged.
Of course, in other embodiments, other storage compartments besides the first storage compartment and the second storage compartment may be provided according to actual needs.
Referring to fig. 1, a high-temperature stage refrigeration cycle circuit 1 includes a high-temperature stage compressor 11, a parallel branch, an evaporation unit 12, and a high-temperature stage return pipe 13 connecting the evaporation unit 12 and the high-temperature stage compressor 11, the high-temperature stage refrigeration cycle circuit 1 flowing a first refrigerant, the parallel branch including a first cooling branch, a second cooling branch, and a third cooling branch, the first cooling branch including a first throttling device 161 and a high-temperature stage evaporator 15, the first throttling device 161 being arranged in series, the second cooling branch including a second throttling device 162, and the third cooling branch including a third throttling device 163, the first refrigerant flowing through the first throttling device 161 and the first refrigerant flowing through the second throttling device 162 exchanging heat with the first refrigerant flowing through the high-temperature stage return pipe 13, respectively. Therefore, the first storage chamber can realize the temperature range of-30-10 ℃, and the temperature can be adjusted in the temperature range.
The low-temperature-stage refrigeration cycle circuit 2 includes a condensation unit 21, and a second refrigerant flows through the low-temperature-stage refrigeration cycle circuit 2, and the second refrigerant flowing through the condensation unit 21 exchanges heat with the first refrigerant flowing through the evaporation unit 12.
The high-temperature stage refrigeration cycle circuit 1 further comprises a switching valve 17 disposed at an inlet of the parallel branch, and the switching valve 17 is selectively communicated with at least one of the first cooling branch, the second cooling branch and the third cooling branch, so as to selectively control a flow direction of the first refrigerant as required, thereby implementing different functions and refrigeration effects.
Thus, when the first refrigerant circulates in the first cooling branch, the high-temperature-stage evaporator 15 can supply cooling to the second storage compartment; when the first refrigerant circulates in the second cooling branch, the first refrigerant flows out of the second cooling branch to the evaporation part 12 in the high-temperature-stage refrigeration cycle circuit 1, and the first refrigerant in the evaporation part 12 can absorb heat of the second refrigerant flowing through the condensation part 21 by heat exchange between the second refrigerant flowing through the condensation part 21 and the first refrigerant flowing through the evaporation part 12, so that the temperature of the second refrigerant in the condensation part 21 can be further reduced, and the second refrigerant is precooled for the low-temperature-stage refrigeration cycle circuit 2, so that the low-temperature-stage refrigeration cycle circuit 2 can achieve a lower temperature; meanwhile, as the first refrigerant flowing through the first throttling device 161 and the first refrigerant flowing through the second throttling device 162 exchange heat with the first refrigerant flowing through the high-temperature-stage air return pipe 13, the first refrigerant in the high-temperature-stage air return pipe 13 can be utilized to cool the first refrigerant in the first throttling device 161 and the second throttling device 162, so as to increase the cooling capacity, and simultaneously improve the suction temperature of the high-temperature-stage compressor 11, so that the suction temperature is raised to about the ambient temperature, so that the cooling efficiency of the high-temperature-stage compressor 11 is improved, and the working efficiency of the high-temperature-stage refrigeration cycle loop 1 is improved; when the low-temperature stage compressor 22 is started, the first refrigerant can circulate in the third cooling branch, so that the problem of large starting pressure at the moment of starting the low-temperature stage compressor 22 can be solved, and as a result, the temperature of the first refrigerant in the evaporation part 12 is too high or even reaches dozens of degrees due to the large heat dissipation capacity of the condensation part 21 at the moment of starting the low-temperature stage compressor 22, when the first refrigerant flows into the high-temperature stage return pipe 13 to exchange heat with the second throttling device 162, the temperature of the first refrigerant in the second throttling device 162 is increased to reduce the flow rate of the first refrigerant, so that the evaporation part 12 cannot provide enough cold for the condensation part 21, and further the starting pressure of the low-temperature stage compressor 22 is large.
Preferably, the first throttling means 161, the second throttling means 162 and the third throttling means 163 are all capillary tubes.
The first throttling device 161 and the second throttling device 162 are respectively thermally connected with the high-temperature-stage return pipe 13 in a sleeved or attached manner, so that the heat exchange efficiency of the first refrigerant circulating between the first throttling device and the high-temperature-stage return pipe is improved, and the energy utilization rate is improved.
Further, the high-temperature-stage refrigeration cycle circuit 1 further includes a high-temperature-stage dry filter 18 disposed between the high-temperature-stage condenser 14 and the parallel branch, and a liquid storage pack 19 disposed between the evaporation unit 12 and the high-temperature-stage return air pipe 13.
The low-temperature stage refrigeration cycle loop 2 further comprises a low-temperature stage compressor 22, a low-temperature stage throttling device 23, a low-temperature stage evaporator 24 and a first gas return pipe section 25 which are arranged in series, and the condensing part 21 is arranged between the low-temperature stage compressor 22 and the low-temperature stage throttling device 23.
Further, the second refrigerant flowing through the first gas return section 25 exchanges heat with the second refrigerant flowing through the low temperature-stage throttling device 23. Therefore, the second refrigerant flowing through the first gas return pipe section 25 can absorb the heat of the second refrigerant flowing through the low-temperature stage throttling device 23, and the temperature of the second refrigerant flowing to the suction port of the low-temperature stage compressor 22 is increased, so that the suction temperature of the low-temperature stage compressor 22 is increased, the energy utilization rate of the low-temperature stage refrigeration cycle loop 2 is increased, and the energy efficiency of the whole refrigeration device is improved.
Preferably, the low-temperature-stage throttling device 23 is a capillary tube, and the first air return pipe section 25 and the low-temperature-stage throttling device 23 are sleeved or attached to each other, so that the heat exchange efficiency of a second refrigerant circulating between the first air return pipe section and the low-temperature-stage throttling device is facilitated, and the energy utilization rate is improved.
Further, the low-temperature stage refrigeration cycle circuit 2 further includes a second air return pipe section 26 and a heat release pipe section 27, the second air return pipe section 26 is disposed between the low-temperature stage evaporator 24 and the low-temperature stage compressor 22, the heat release pipe section 27 is disposed between the low-temperature stage compressor 22 and the condensing portion 21, and the second refrigerant flowing through the second air return pipe section 26 exchanges heat with the second refrigerant flowing through the heat release pipe section 27. Therefore, the second refrigerant flowing through the second air return pipe section 26 can absorb the heat of the second refrigerant flowing through the heat release pipe section 27, the air suction temperature of the low-temperature stage compressor 22 is increased, the cold quantity of the second refrigerant flowing from the heat release pipe section 27 to the condensation part 21 is reduced, the low-temperature stage refrigeration cycle loop 2 can achieve lower temperature, the temperature of the second storage compartment can be adjusted within the temperature range of-60 ℃ to-20 ℃, the energy utilization rate of the low-temperature stage refrigeration cycle loop 2 is increased, and the energy efficiency of the whole refrigeration device is improved.
Preferably, the second gas return pipe section 26 is located between the first gas return pipe section 25 and the low-temperature stage compressor 22, so that the energy utilization rate of the low-temperature stage refrigeration cycle circuit 2 can be maximally improved.
The second return air pipe section 26 and the heat release pipe section 27 are sleeved or attached to each other, so that the heat exchange efficiency of the second refrigerant flowing in the second return air pipe section and the heat release pipe section is improved, and the energy utilization rate is improved.
Further, the low-temperature-stage refrigeration cycle circuit 2 further includes a low-temperature-stage radiating pipe 28 disposed between the low-temperature-stage compressor 22 and the radiating pipe section 27, and a low-temperature-stage dry filter 29 disposed between the condensing portion 21 and the low-temperature-stage throttling device 23. The second refrigerant flowing out of the low-temperature stage compressor 22 can be radiated by the low-temperature stage radiator pipe 28, so that the low-temperature stage refrigeration cycle circuit 2 can achieve a lower temperature; the second refrigerant flowing out of the condensing portion 21 may be dried and filtered by the low-temperature stage filter-drier 29.
The first refrigerant and the second refrigerant may be the same refrigerant or different refrigerants.
In addition, "high temperature" and "low temperature" in the "high temperature stage refrigeration cycle circuit 1" and the "low temperature stage refrigeration cycle circuit 2" are relative terms, and the evaporation temperature of the first refrigerant flowing through the high temperature stage refrigeration cycle circuit 1 is relatively higher than the evaporation temperature of the second refrigerant flowing through the low temperature stage refrigeration cycle circuit 2.
The refrigerating device further comprises a controller, wherein the controller is connected with the switching valve 17 and is used for controlling the communication states of the switching valve 17, the first cold supply branch, the second cold supply branch and the third cold supply branch according to the temperatures of the first storage chamber and the second storage chamber.
In particular, the controller is configured to,
if the temperature T of the first storage chamber 1 Not less than the preset starting temperature T 1 on Then, determine T 1 Whether it is higher than the preset temperature T 0 ；
If yes, the switching valve 17 is controlled to be communicated with the third cooling branch and the high-temperature stage compressor 11 is controlled to be started;
after the preset time t1, controlling the low-temperature stage compressor 22 to start;
after a preset time t2, the switching valve 17 is controlled to be switched to be communicated with the second cooling branch.
Thus, when both the high-temperature-stage compressor 11 and the low-temperature-stage compressor 22 are in the stopped stateThe first storage chamber needs refrigeration and has a temperature higher than a preset temperature T 0 During the process, the switching valve 17 is controlled to be communicated with the third cold supply branch and control the high-temperature stage compressor 11 to start, so that the problem of high starting pressure at the moment of starting the low-temperature stage compressor 22 can be solved, and because the first refrigerant in the third cold supply branch does not exchange heat with the first refrigerant in the high-temperature stage return air pipe 13, the flow of the first refrigerant in the third cold supply branch is prevented from being reduced, the evaporation part 12 is ensured to provide enough cold for the condensation part 21, and the pressure at the moment of starting the low-temperature stage compressor 22 is prevented from being too high. Further, after the preset time t1, the evaporation part 12 provides enough cooling capacity for the condensation part 21, at this time, the low-temperature stage compressor 22 is started, and the low-temperature stage refrigeration cycle loop 2 supplies cooling capacity for the first storage compartment. After a preset time t2, the low-temperature stage compressor 22 operates stably, the switching valve 17 is controlled to be switched to be communicated with the second cold supply branch, the first refrigerant flowing through the second throttling device 162 exchanges heat with the first refrigerant flowing through the high-temperature stage return pipe 13, so that the first refrigerant in the high-temperature stage return pipe 13 can be used for cooling the first refrigerant in the second throttling device 162, the refrigerating capacity is increased, the suction temperature of the high-temperature stage compressor 11 is increased to about the ambient temperature, the refrigerating efficiency of the high-temperature stage compressor 11 is improved, the cooling capacity of the evaporation part 12 to the condensation part 21 is further improved, the refrigerating efficiency of the low-temperature stage refrigeration cycle loop 2 is improved, and the energy utilization rate of the refrigerating device is improved.
Preferably, T 0 = 30-5 ℃, thereby avoiding the actual temperature T of the first storage chamber 1 When the temperature is too high, the start pressure of the low-temperature stage compressor 22 becomes high.
Preferably, t1 is less than or equal to 5min, so as to ensure that the evaporation part 12 provides enough cold for the condensation part 21 and avoid that the first storage chamber cannot be cooled for a long time.
Preferably, t2= 0.5-10 min, and by this period of time, the pressure of the low-temperature-stage compressor 22 tends to be stable, and meanwhile, the refrigeration efficiency of the low-temperature-stage refrigeration cycle loop 2 is favorably improved, so that the temperature in the first storage compartment reaches the preset temperature as soon as possible, and the starting efficiency is improved.
Further, the controller is also configured to,
if T 1 Not more than T 0 Then the switching valve 17 is controlled to be switched to be communicated with the second cooling branch and the high-temperature stage compressor 11 is controlled to be started;
and after the preset time t1, controlling the low-temperature stage compressor 22 to start.
When the first storage compartment needs to be refrigerated and the temperature T of the first storage compartment is higher than the temperature T of the first storage compartment under the condition that the high-temperature-stage compressor 11 and the low-temperature-stage compressor 22 are both in a shutdown state 1 Not higher than a preset temperature T 0 In this case, the evaporation portion 12 supplies cold to the condensation portion 21 directly through the second cold supply branch, so that the first refrigerant flowing through the second throttling device 162 exchanges heat with the first refrigerant flowing through the high-temperature stage air return pipe 13, thereby increasing the cold supply amount of the evaporation portion 12 to the condensation portion 21, accelerating the pre-cooling efficiency, and increasing the starting efficiency.
Further, the controller is also configured to,
if T 1 <T 1 opener And the temperature T of the second storage compartment 2 Not less than the preset starting temperature T 2-opening Then the control switch valve 17 is switched to communicate with the first cooling branch and controls the high temperature stage compressor 11 to start.
That is to say, when the first storage compartment needs to be refrigerated and the second storage compartment does not need to be refrigerated, the first storage compartment can be refrigerated by controlling the switching valve 17 to be communicated with the first cold supply branch and controlling the high-temperature stage compressor 11 to be started, so that the first storage compartment can reach the preset temperature as soon as possible.
The utility model also provides a control method of the refrigerating device, which comprises the following steps,
if the temperature T of the first storage chamber 1 Not less than the preset starting temperature T 1 on Then, determine T 1 Whether it is higher than the preset temperature T 0 ；
If yes, the switching valve 17 is controlled to be communicated with the third cooling branch and the high-temperature stage compressor 11 is controlled to be started;
after the preset time t1, controlling the low-temperature stage compressor 22 to start;
after a preset time t2, the switching valve 17 is controlled to be switched to be communicated with the second cooling branch.
In this way, when the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are both in the shutdown state, the first storage compartment needs to be cooled and the temperature of the first storage compartment is higher than the preset temperature T 0 During the process, the switching valve 17 is controlled to be communicated with the third cold supply branch and control the high-temperature stage compressor 11 to start, so that the problem of high starting pressure at the moment of starting the low-temperature stage compressor 22 can be solved, and because the first refrigerant in the third cold supply branch does not exchange heat with the first refrigerant in the high-temperature stage return air pipe 13, the flow of the first refrigerant in the third cold supply branch is prevented from being reduced, the evaporation part 12 is ensured to provide enough cold for the condensation part 21, and the pressure at the moment of starting the low-temperature stage compressor 22 is prevented from being too high. Further, after the preset time t1, the evaporation part 12 provides enough cooling capacity for the condensation part 21, at this time, the low-temperature stage compressor 22 is started, and the low-temperature stage refrigeration cycle loop 2 supplies cooling capacity for the first storage compartment. After a preset time t2, the low-temperature stage compressor 22 operates stably, the switching valve 17 is controlled to be switched to be communicated with the second cold supply branch, the first refrigerant flowing through the second throttling device 162 exchanges heat with the first refrigerant flowing through the high-temperature stage return pipe 13, so that the first refrigerant in the high-temperature stage return pipe 13 can be used for cooling the first refrigerant in the second throttling device 162, the refrigerating capacity is increased, the suction temperature of the high-temperature stage compressor 11 is increased to about the ambient temperature, the refrigerating efficiency of the high-temperature stage compressor 11 is improved, the cooling capacity of the evaporation part 12 to the condensation part 21 is further improved, the refrigerating efficiency of the low-temperature stage refrigeration cycle loop 2 is improved, and the energy utilization rate of the refrigerating device is improved.
Preferably, T 0 = 30-5 ℃, thereby avoiding the actual temperature T of the first storage chamber 1 When the temperature is too high, the start pressure of the low-temperature stage compressor 22 becomes high.
Preferably, t1 is less than or equal to 5min, so as to ensure that the evaporation part 12 provides enough cold for the condensation part 21 and avoid that the first storage chamber cannot be cooled for a long time.
Preferably, t2= 0.5-10 min, and by this time, the pressure of the low-temperature-stage compressor 22 tends to be stable, and the improvement of the refrigeration efficiency of the low-temperature-stage refrigeration cycle loop 2 is facilitated, so that the temperature in the first storage compartment reaches the preset temperature as soon as possible, and the starting efficiency is improved.
Further, the control method may further include,
if T 1 Not more than T 0 Then the switching valve 17 is controlled to be switched to be communicated with the second cooling branch and the high-temperature stage compressor 11 is controlled to be started;
and after the preset time t1, controlling the low-temperature stage compressor 22 to start.
When the first storage compartment needs to be refrigerated and the temperature T of the first storage compartment is higher than the temperature T of the first storage compartment under the condition that the high-temperature-stage compressor 11 and the low-temperature-stage compressor 22 are both in a shutdown state 1 Not higher than a preset temperature T 0 In this case, the evaporation portion 12 supplies cold to the condensation portion 21 directly through the second cold supply branch, so that the first refrigerant flowing through the second throttling device 162 exchanges heat with the first refrigerant flowing through the high-temperature-stage air return pipe 13, the cold supply amount of the evaporation portion 12 to the condensation portion 21 can be increased, the temperature in the first storage compartment reaches the preset temperature as soon as possible, and the starting efficiency is improved.
Further, the control method may further include,
if T 1 <T 1 on And the temperature T of the second storage compartment 2 Not less than the preset starting temperature T 2-opening Then the control switch valve 17 is switched to communicate with the first cooling branch and controls the high temperature stage compressor 11 to start.
That is to say, when the first storage compartment needs to be refrigerated and the second storage compartment does not need to be refrigerated, the first storage compartment can be refrigerated by controlling the switching valve 17 to be communicated with the first cold supply branch and controlling the high-temperature stage compressor 11 to be started, so that the first storage compartment can reach the preset temperature as soon as possible.
Compared with the prior art, the utility model provides a cascade compression refrigerating system 100, refrigerating plant and refrigerating plant's that has it control method, its beneficial effect lies in: when the first refrigerant circulates in the first cooling branch, the high-temperature-stage evaporator 15 supplies cooling to the second storage compartment; when the first refrigerant circulates in the second cooling branch, the first refrigerant flows out of the second cooling branch to the evaporation part 12 in the high-temperature-stage refrigeration cycle circuit 1, and the first refrigerant in the evaporation part 12 can absorb heat of the second refrigerant flowing through the condensation part 21 by heat exchange between the second refrigerant flowing through the condensation part 21 and the first refrigerant flowing through the evaporation part 12, so that the temperature of the second refrigerant in the condensation part 21 can be further reduced, and the second refrigerant is precooled for the low-temperature-stage refrigeration cycle circuit 2, so that the low-temperature-stage refrigeration cycle circuit 2 can achieve a lower temperature; meanwhile, as the first refrigerant flowing through the first throttling device 161 and the first refrigerant flowing through the second throttling device 162 exchange heat with the first refrigerant flowing through the high-temperature-stage air return pipe 13, the first refrigerant in the high-temperature-stage air return pipe 13 can be utilized to cool the first refrigerant in the first throttling device 161 and the second throttling device 162, so as to increase the cooling capacity, and simultaneously improve the suction temperature of the high-temperature-stage compressor 11, so that the suction temperature is raised to about the ambient temperature, so that the cooling efficiency of the high-temperature-stage compressor 11 is improved, and the working efficiency of the high-temperature-stage refrigeration cycle loop 1 is improved; when the low-temperature stage compressor 22 is started, the first refrigerant can circulate through the third cooling branch, so that the problem of high starting pressure at the moment of starting the low-temperature stage compressor 22 can be solved.
It should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole may be appropriately combined to form other embodiments as will be apparent to those skilled in the art.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A cascade compression refrigeration system, comprising,
the high-temperature stage refrigeration cycle loop comprises a high-temperature stage compressor, a parallel branch, an evaporation part, a switching valve and a high-temperature stage gas return pipe, wherein the switching valve is arranged at an inlet of the parallel branch, the high-temperature stage gas return pipe is connected with the evaporation part and the high-temperature stage compressor, a first refrigerant flows through the high-temperature stage refrigeration cycle loop, the parallel branch comprises a first cooling branch, a second cooling branch and a third cooling branch which are arranged in parallel, the switching valve is selectively communicated with at least one of the first cooling branch, the second cooling branch and the third cooling branch, the first cooling branch comprises a first throttling device and a high-temperature stage evaporator which are arranged in series, the second cooling branch comprises a second throttling device, and the third cooling branch comprises a third throttling device;
and the low-temperature stage refrigeration cycle loop comprises a low-temperature stage compressor and a condensing part, wherein a second refrigerant flows in the low-temperature stage refrigeration cycle loop, and the second refrigerant flowing through the condensing part exchanges heat with the first refrigerant flowing through the evaporating part.
2. The cascade compression refrigeration system according to claim 1, wherein the low temperature stage refrigeration cycle further comprises a low temperature stage throttling device, a low temperature stage evaporator and a first return air pipe section arranged in series, and the condensing portion is arranged between the low temperature stage compressor and the low temperature stage throttling device.
3. The cascade compression refrigeration system of claim 2, wherein the second refrigerant flowing through the first return gas tube segment exchanges heat with the second refrigerant flowing through the low temperature stage throttling device.
4. The cascade compression refrigeration system according to claim 2, wherein the low temperature stage refrigeration cycle further comprises a second return air pipe section and a heat release pipe section, the second return air pipe section is disposed between the low temperature stage evaporator and the low temperature stage compressor, the heat release pipe section is disposed between the low temperature stage compressor and the condensation portion, and the second refrigerant flowing through the second return air pipe section exchanges heat with the second refrigerant flowing through the heat release pipe section.
5. The cascade compression refrigeration system of claim 4, wherein the second return gas leg is located between the first return gas leg and the low temperature stage compressor.
6. The cascade compression refrigeration system according to claim 4, wherein the second return air duct segment is nested or abutted against the heat release duct segment.
7. The cascade compression refrigeration system according to claim 4, wherein the low temperature stage throttling device is a capillary tube, and the first return air tube section and the low temperature stage throttling device are sleeved or attached to each other.
8. The cascade compression refrigeration system according to claim 1, wherein said first throttling device and said second throttling device are respectively sleeved with or attached to said high temperature stage muffler.
9. A refrigerating device comprising a box body, wherein the box body further comprises the cascade compression refrigerating system as recited in any one of claims 1 to 8, the box body is provided with a first storage chamber and a second storage chamber, the low-temperature stage refrigerating circulation loop supplies cold to the first storage chamber, and the high-temperature stage refrigerating circulation loop supplies cold to the second storage chamber.
10. The refrigeration unit of claim 9, further comprising a controller coupled to the switching valve and configured to: and controlling the communication state of the switching valve with the first cold supply branch, the second cold supply branch and the third cold supply branch according to the temperature of the first storage chamber and the second storage chamber.
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| CN202221698245.2U CN218096667U (en) | 2022-06-30 | 2022-06-30 | Cascade compression refrigeration system, refrigerating plant |
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| CN202221698245.2U CN218096667U (en) | 2022-06-30 | 2022-06-30 | Cascade compression refrigeration system, refrigerating plant |
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